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ARC: perf: Add kernel callchain support 

Signed-off-by: Mischa Jonker <mjonker@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
hifive-unleashed-5.1
Vineet Gupta 2013-11-12 11:00:03 +01:00
parent 0a8a476793
commit 389e3160b9
1 changed files with 29 additions and 0 deletions
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29
arch/arc/kernel/perf_event.c
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@ -16,6 +16,7 @@
#include <linux/perf_event.h>
#include <linux/platform_device.h>
#include <asm/arcregs.h>
#include <asm/stacktrace.h>
struct arc_pmu {
struct pmu pmu;
@ -25,6 +26,34 @@ struct arc_pmu {
int ev_hw_idx[PERF_COUNT_ARC_HW_MAX];
};
struct arc_callchain_trace {
int depth;
void *perf_stuff;
};
static int callchain_trace(unsigned int addr, void *data)
{
struct arc_callchain_trace *ctrl = data;
struct perf_callchain_entry *entry = ctrl->perf_stuff;
perf_callchain_store(entry, addr);
if (ctrl->depth++ < 3)
return 0;
return -1;
}
void
perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs)
{
struct arc_callchain_trace ctrl = {
.depth = 0,
.perf_stuff = entry,
};
arc_unwind_core(NULL, regs, callchain_trace, &ctrl);
}
static struct arc_pmu *arc_pmu;
/* read counter #idx; note that counter# != event# on ARC! */